It can also be a pain if the stock is not exactly 1/2" thick. Most 1/2" ply is not really 1/2" thick, it's more like 15/32" or 12mm or something.
That can mess up the way things line up. You can also end up with a loose joint, because after taking 1/4" off for the rabbet, what is left (on the bottom piece in the pic) is less than 1/4" -- it is 7/32"
That is why I use the 1/2" poplar project pieces when i can. That stuff is much more faithful about being 1/2" thick.
Last edited by Chris Curl; 03-06-2013 at 01:29 AM.